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The filter circuit of the output return circuit

2017-02-21 04:45  
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The filter circuit of the output return circuit
In the frequency range of 0.15~1MHz, the harassment mainly exists in the form of common mode, in the frequency range of 1~10MHz, the harassment mainly exists in the forms of differential mode and common mode, when the frequency range is higher than 10MHz, the harassment mainly exists in the form of common mode. The differential mode harassment is caused by the switch tube that is in the operating state, when the switch tube opens, the current of the power line rises linearly, when the switch tube closes, the current is zero, so the current of the power line is the high frequency triangle pulse current, and it has rich high-frequency harmonic component.